Finding the Fourth Proportional to 12,688.44, 17,508.42 and 7,384.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688.44 : 17,508.42 = 7,384.02 : x
2. Step 2: Convert to fraction form
   12,688.44/17,508.42 = 7,384.02/x
3. Step 3: Cross multiply
   12,688.44x = 17,508.42 × 7,384.02
4. Step 4: Simplify right side
   12,688.44x = 129,282,523.45
5. Step 5: Solve for x
   x = 129,282,523.45/12,688.44
6. Step 6: Final answer
   x = 10,189.00